Effect Of Interfacial Curvature On Drag Reduction Of Superhydrophobic Microchannels,
2018
Key Lab of Condition Monitoring and Control for Power Plant Equipment of Education Ministry (North China Electric Power University), Baoding 071003, China;
Effect Of Interfacial Curvature On Drag Reduction Of Superhydrophobic Microchannels, Chunxi Li, Zhang Shuo, Xuemin Ye
Journal of System Simulation
Abstract: The two-dimensional fluid flow in superhydrophobic microchannels with transverse grooves was numerically simulated with Fluent to investigate the impact of the liquid-gas interface curvature on the effective slip behavior in the laminar regime. The effects of shear-free fraction, normalized periodic cell length and Reynolds number on the normalized slip length and pressure drop reduction are also examined. The results show that as protrusion angle increases, the normalized slip length and pressure drop reduction exhibit with single-hump variations. When θ=θopt, increments in the normalized slip length and pressure drop reduction tend to be greater as shear-free …
Imu Single-Axis Rotation Method And Error Analysis Of Modulation Inertial Navigation System,
2018
School of Geomatics, Liaoning Technical University, Fuxin 123000, China;
Imu Single-Axis Rotation Method And Error Analysis Of Modulation Inertial Navigation System, Sun Wei, Ruibao Li, Zhang Yuan, Yang Dan
Journal of System Simulation
Abstract: Aiming at the problem that inertial device bias has an influence on the improvement of system precision, a single axis error modulation scheme whose sensitive axis is misalignment with rotation axis which can continuously rotate in clockwise and counterclockwise is proposed. Based on the same level precision of inertial components in IMU, the IMU is installed on rotation mechanism with non-coincidence. The symmetric part of inertial device deviation can be compensated by the positive and negative cancellation of the device deviation in the rotation axis direction and the rotation modulation in the vertical plane of the rotary axis. The …
A Proposed Taxonomy For The Systems Statistical Engineering Body Of Knowledge,
2018
Old Dominion University
A Proposed Taxonomy For The Systems Statistical Engineering Body Of Knowledge, Teddy Steven Cotter
Engineering Management & Systems Engineering Faculty Publications
In the ASEM-IAC 2012, Cotter (2012) identified the gaps in knowledge that statistical engineering needs to address, explored additional gaps in knowledge not addressed in the prior works, and set forth a working definition of and body of knowledge for statistical engineering. In the ASEM-IAC 2015, Cotter (2015) proposed a systemic causal Bayesian hierarchical model that addressed the knowledge gap needed to integrate deterministic mathematical engineering causal models within a stochastic framework. Missing, however, is the framework for specifying the hierarchical qualitative systems structures necessary and sufficient for specifying systemic causal Bayesian hierarchical models. In the ASEM-IAC 2016, Cotter (2016) …
Systems Statistical Engineering – Systems Hierarchical Constraint Propagation,
2018
Old Dominion University
Systems Statistical Engineering – Systems Hierarchical Constraint Propagation, Teddy Steven Cotter, Peggy A. Quigley
Engineering Management & Systems Engineering Faculty Publications
Cotter (ASEM-IAC 2012, 2015, 2016, 2017): (1) identified the gaps in knowledge that statistical engineering needed to address and set forth a working definition of and body of knowledge for statistical engineering; (2) proposed a systemic causal Bayesian hierarchical model that addressed the knowledge gap needed to integrate deterministic mathematical engineering causal models within a stochastic framework; (3) specified the modeling methodology through which statistical engineering models could be developed, diagnosed, and applied to predict systemic mission performance; and (4) proposed revisions to and integration of IDEF0 as the framework for developing hierarchical qualitative systems models. In the last work, …
A Method For Identification, Representation, And Assessment Of Complex System Pathologies In Acquisition Programs,
2018
Old Dominion University
A Method For Identification, Representation, And Assessment Of Complex System Pathologies In Acquisition Programs, Charles B. Keating, Polinpapilinho F. Katina, Keith F. Joiner, Joseph M. Bradley, Raed M. Jaradat
Engineering Management & Systems Engineering Faculty Publications
Acquisition programs continue to struggle with increasing complexity. High degrees of emergence, interconnectedness, and uncertainty are the norm rather than exception. The purpose of this research is to explore extension of ongoing research in complex system pathologies for acquisition programs. Significant advances have been made in development of deeper understanding of the nature of pathologies (deviations from healthy system function) and their implications for performance of complex systems. Complex system pathologies represent violations of underlying system principles. These violations negatively affect system governance functions (control, oversight, accountability) resulting in degradation of system performance. Greater understanding of complex system pathologies offers …
A Systems Theory Based Examination Of Failure In Acquisition System Reform,
2018
Old Dominion University
A Systems Theory Based Examination Of Failure In Acquisition System Reform, Charles B. Keating, Joseph M. Bradley, Polinpapilinho F. Katina, Craig Arndt
Engineering Management & Systems Engineering Faculty Publications
The defense acquisition system has been the source of intense scrutiny and calls for reform for over four decades. This research is to examine the contributions of Systems Theory to enhance prospects related to acquisition reform. Systems Theory offers a set of principles, laws, and concepts that explain the behavior of complex systems. Although the acquisition system and constituent programs have been critiqued and examined from multiple perspectives, they have never been the subject of exploration from Systems Theory. Recent advances in Systems Theory have identified 83 different potential system pathologies that can result in degraded system performance or outright …
Adaptation Of Legacy Computer Science Complexity Metrics To Sysml Diagrams,
2017
University of Alabama in Huntsville
Adaptation Of Legacy Computer Science Complexity Metrics To Sysml Diagrams, Victor Lopez
Von Braun Symposium Student Posters
No abstract provided.
Internet Of Vehicles: Architecture, Applications, And Security Requirements Of Cognitive Radio Adhoc Vehicular Network,
2017
University of Arkansas Little Rock
Internet Of Vehicles: Architecture, Applications, And Security Requirements Of Cognitive Radio Adhoc Vehicular Network, Sachin Sharma
Theses and Dissertations
In recent years, the demand for spectrum has increased exponentially. Cognitive radio (CR) technology provides the capability to dynamically sense the spectrum for available channels, estimate them and select a good channel. This thesis introduces the concept of dynamic spectrum leasing methodology (DSLM), a paradigm based on game theoretic concepts. DSLM takes into account the demand for spectrum by secondary users and the willingness of primary users to relinquish spectrum in a restricted manner, making possible spectrum leasing as a long-term commercially viable concept. This thesis also introduces the notion of a Cognitive Radio Network Service Provider (CRNSP) and the …
Protecting Non-Public Information In Community Banks: A Study For Implementing Risk Based Framework For Protecting Non Public Personal Information,
2017
University of Arkansas Little Rock
Protecting Non-Public Information In Community Banks: A Study For Implementing Risk Based Framework For Protecting Non Public Personal Information, Bruce Lee Upton
Theses and Dissertations
In today’s world it seems that cyber hackers, cyber terrorists, and cyber activists make headlines almost every day. Information security has become a major concern for bankers from both a reputation and regulatory examination standpoint. Bank management is tasked to answer a litany of questions. Is my bank secure? What impact does this security have on productivity? What solutions are cost effective? What impact will a security breach have on my bank and respective customer base? Additionally, many bankers don’t have on-staff expertise to answer these questions. Having a framework where bankers can know how likely it is they will …
Investment Plan Against Malicious Attacks On Power Networks: Multilevel Game-Theoretic Models With Shared Cognition,
2017
University of Arkansas Little Rock
Investment Plan Against Malicious Attacks On Power Networks: Multilevel Game-Theoretic Models With Shared Cognition, Hamzeh Davarikia
Theses and Dissertations
The work reported in this thesis aims at developing a practical tool for utility transmission planners to protect power network from potential attacks. To efficiently address the problem, we propose a new formulation for defender which has a promising result than its counterpart. Moreover, the optimum defending strategy in power network is modeled which return the best protecting strategy based on the defender resources. Going beyond the common approaches in literature, defender deception is mathematically formulated by releasing misinformation about his plan in the shared cognition based model. The problems are formulated as tri-level mixed-integer non-linear programming and exact linearization …
Integrating Idef0 Into A Systems Framework For Statistical Engineering,
2017
Old Dominion University
Integrating Idef0 Into A Systems Framework For Statistical Engineering, Teddy Steven Cotter
Engineering Management & Systems Engineering Faculty Publications
Driven by a growing requirement during the 21st century for the integration of rigorous statistical analyses in engineering research, there has been a movement within the statistics and quality communities to evolve a unified statistical engineering body of knowledge (Horel and Snee, 2010; Anderson-Cook, 2012). Outside of the 2014 Statistical Engineering Agreement among the ASQ Statistics Division, DOT&E, NASA, and IDA, there has been little formal progress toward this goal since the May 2011 NASA Symposium on Statistical Engineering in Williamsburg Virginia. In the ASEM-IAC 2012, Cotter (2012) identified the gaps in knowledge that statistical engineering needs to address, explored …
Cockpit In The Systems Engineering Lenses,
2017
Old Dominion University
Cockpit In The Systems Engineering Lenses, Aysen K. Taylor, Charles B. Keating, T. Steven Cotter
Engineering Management & Systems Engineering Faculty Publications
The commercial transport aircraft of today vary greatly from early aircraft in regards to how they are controlled and the feedback provided from the machine to the human operator. Automation has improved operational precision and efficiency but at the cost of providing less feedback. Pilots are the last line of defense and current technology cannot provide the human ability to solve novel problems for which no computer logic can be written. The automated cockpits of today have may sub-components that interact in a manner often opaque and unpredictable when a sensor or sub-component fails or even in situations where no …
A Systems Theoretic-Based Framework To Discover Pathologies In Acquisition System Governance,
2017
Old Dominion University
A Systems Theoretic-Based Framework To Discover Pathologies In Acquisition System Governance, Charles B. Keating, Joseph M. Bradley, Polinpapilinho F. Katina, Ra'ed M. Jaradat
Engineering Management & Systems Engineering Faculty Publications
The acquisition field continues to face increasing pressures to perform under conditions of escalating complexity, uncertainty, and ambiguity. These conditions suggest that traditional approaches, practices, and acquisition technologies might be incongruent with support demands for acquisition practitioners. This research is focused on exploiting and extending recent developments in Complex System Governance (CSG) to advance the acquisition field. CSG is focused on the design, execution, and evolution of fundamental system functions necessary for control, communications, coordination, and integration of complex systems (e.g., acquisition). CSG is based in Systems Theory (fundamental laws governing complex systems), Management Cybernetics (the science of effective system …
Systemic Intervention For Complex System Governance Development,
2017
Old Dominion University
Systemic Intervention For Complex System Governance Development, Charles B. Keating, Polinpapilinho F. Katina,, John C. Pyne, Ra’Ed M. Jaradat
Engineering Management & Systems Engineering Faculty Publications
This paper explores the issues related to systemic intervention for Complex System Governance (CSG) development. Systemic intervention seeks to intentionally engage a system to influence trajectory or outcomes. CSG is an emerging field focused on the design, execution, and evolution of the functions necessary to provide continued system performance (stability) in the midst of incessant turbulence and increasing complexity. Integral to this field is the necessity to ‘intervene’ in a complex system to enhance system behavior, structure, or performance. Arguably, system interventions have an unremarkable record of success, ranging from declared success in improving a situation (system) to abysmal failure …
Girl’S Cybersecurity Camp,
2016
Brigham Young University
Girl’S Cybersecurity Camp, Sarah Cunha, Dale Rowe
Journal of Undergraduate Research
In 2015, the BYU Cybersecurity Research Lab (CSRL) held its first annual summer camp for Girls aged 14-18. A total of 38 girls attended the week’s activities and workshops. While over 75% of girls indicated they had taken a computing-related class, only 40% reported any significant interest in cybersecurity prior to the summercamp with 10% believing they had some experience in the field. At the conclusion of the camp, 80% of attendees reported a significant interest in the field with 100% of attendees interested in attending a similar event again.
Systemic Analysis Of Complex System Governance For Acquisition,
2016
Old Dominion University
Systemic Analysis Of Complex System Governance For Acquisition, Charles B. Keating, Joseph M. Bradley, Polinpapilinho F. Katina
Engineering Management & Systems Engineering Faculty Publications
The purpose of this paper is to explore Complex System Governance (CSG) issues related to systemic analysis of acquisition systems. CSG is an emerging field focused on the design, execution, and evolution of the functions necessary to provide continued system performance (stability) in the midst of incessant turbulence and increasing complexity. Integral to this field is the necessity to engage systems to address behavior or performance that is inconsistent with that which is desired. Systemic analysis for CSG serves to examine a system to discover fundamental system issues (e.g. acquisition). Arguably, system acquisition has an unremarkable record of success, ranging …
Cyber-Physical Systems: Complex System Governance As An Integrating Construct,
2016
Old Dominion University
Cyber-Physical Systems: Complex System Governance As An Integrating Construct, Polinpapilinho F. Katina, Charles B. Keating, Adrian V. Gheorghe
Engineering Management & Systems Engineering Faculty Publications
This paper examines contributions of Complex System Governance (CSG) as an integrating construct for the emerging fields of critical cyber-physical systems (CPS). CPS is concerned with physical entities that are controlled by computational elements. The field is relatively new, emerging, and also somewhat fragmented in development. There are multiple agencies, entities, and activities being undertaken to address a nexus of emerging issues (e.g., cybersecurity) in critical infrastructures. However, the development of critical CPS, as a field, albeit with good intentions and efforts, appears to be largely ‘self-organizing.’ In response, we suggest CSG as an organizing construct capable of provided a …
Complex System Governance For Acquisition,
2016
Leading Charge, LLC
Complex System Governance For Acquisition, Joseph Bradley, Polinpapilinho Katina, Charles Keating
Engineering Management & Systems Engineering Faculty Publications
As acquisition processes have become more complex, they appear to no longer be governable by traditional approaches. Missed budgets, delayed deliveries, and expensive canceled systems appear to becoming more prevalent. Numerous investigations have been conducted attempting to elicit the factors that prevented success. Those systems that succeed in terms of usability, budget, and delivery schedule are the rarity and often become case studies themselves as we try to extract the characteristics that differentiate success from failure. A different viewpoint is to look at the acquisition system from the perspective of Complex Systems Governance (CSG). Recent developments in the field of …
The Role Of 'Metasystem' In Engineering A System Of Systems,
2016
Old Dominion University
The Role Of 'Metasystem' In Engineering A System Of Systems, Polinpapilinho F. Katina, Charles B. Keating, Joseph M. Bradley
Engineering Management & Systems Engineering Faculty Publications
Fundamentally, a system of systems is characterized by operational independence, managerial independence, evolutionary development, emergent behavior, and geographical distribution. However, value-wise, a system of systems should provide greater capability beyond that which individual systems can provide. Enabling this greater capability has to be purposely designed for and managed. In this paper, we argue that this is the primary role of the metasystem structure and its execution. A metasystem is a governing structure that provides coordination and integration of multiple systems, brought together to achieve overarching missions and functions beyond those of the constituent systems. This paper articulates the differences between …
Statistical Engineering: A Causal-Stochastic Modeling Research Update,
2015
Old Dominion University
Statistical Engineering: A Causal-Stochastic Modeling Research Update, Teddy Steven Cotter
Engineering Management & Systems Engineering Faculty Publications
In the ASEM-IAC 2012, Cotter (2012) summarized prior works that led to the proposal for statistical engineering, identified the gaps in knowledge that statistical engineering needs to address, explored additional gaps in knowledge not addressed in the prior works, set forth a working definition of and body of knowledge for statistical engineering, and set forth proposals of potential systems contributions the Engineering Management profession could make toward the development of statistical engineering. In 2014, the ASQ Statistics Division, DOT&E, NASA, and IDA co-sponsored a Statistical Engineering Agreement to jointly research development of the discipline of statistical engineering. The statistics community …
